/*
 * Copyright 2021 bytedance
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Create Date : 2021/2/25
 */
package com.bytedance.volc.voddemo.utils;

import android.graphics.Rect;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class GridDecoration extends RecyclerView.ItemDecoration {
    private final int mSizeGridHorizontalSpacingPx;
    private final int mSizeGridVerticalSpacingPx;
    private final int mGridSize;

    public GridDecoration(int sizeGridHorizontalSpacingPx, int sizeGridVerticalSpacingPx, int gridSize) {
        this.mSizeGridHorizontalSpacingPx = sizeGridHorizontalSpacingPx;
        this.mSizeGridVerticalSpacingPx = sizeGridVerticalSpacingPx;
        this.mGridSize = gridSize;
    }

    @Override
    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull
            RecyclerView parent, @NonNull RecyclerView.State state) {
        final int position = parent.getChildAdapterPosition(view);
        if (position < mGridSize) {
            outRect.top = 0;
        } else {
            outRect.top = mSizeGridVerticalSpacingPx;
        }

        if (position % mGridSize == 0) {
            outRect.left = 0;
        } else {
            outRect.left = mSizeGridHorizontalSpacingPx / 2;
        }

        if ((position + 1) % mGridSize == 0) {
            outRect.right = 0;
        } else {
            outRect.right = mSizeGridHorizontalSpacingPx / 2;
        }

        outRect.bottom = 0;
    }
}
